Auto Cool Expert -37°C is a long-life, ready-to-use coolant based on monoethylene glycol, formulated with a hybrid organic/non-organic additive technology known as Hybrid Tech. This product is compatible with all monoethylene glycol-based coolants and is recommended for all types of cooling systems, including those in passenger cars, heavy-duty vehicles, construction and agricultural machinery, gardening equipment, marine engines, and stationary engines.